Investigate changes that happen in the presence of oxygen

Watch and observe.

Match the images to its corresponding processes.

Match

Match the following

Burning

Rusting

Oxidation

Plant Respiration

Breathing

• Burning

• Rusting

• Oxidation

• Plant Respiration

• Breathing

Multiple Choice

Sam left his iron toy car outside in the rain, and it started to rust. Which of the following actions could Sam take to prevent the car from rusting further?

• Leave it in a sunny spot to dry.

• Wash the car with water and soap regularly.

• Paint the car to protect the metal from air and water.

• Keep the car in a damp place.

Multiple Choice

While having a barbecue, Tim notices that the flames are getting very high. His dad tells him to cover the grill with a lid. How does this help to prevent the fire from getting out of control?

• It blocks the wind from blowing on the flames.

• It cuts off the supply of oxygen, which the fire needs to keep burning.

• It cools down the grill, lowering the temperature of the flames.

• It adds more smoke to the fire, making it burn slower.

Multiple Choice

John is roasting marshmallows over a campfire. He notices that the marshmallow turns black when it gets too close to the flames. Which of the following explains why the marshmallow turns black?

• The heat from the fire removes all the sugar from the marshmallow.

• The marshmallow reacts with the oxygen in the air, causing it to burn and turn black.

• The marshmallow absorbs too much moisture from the fire, making it black.

• The fire cools down the marshmallow, turning it black.

Multiple Choice

Maria is lighting a candle in a room. She accidentally places a glass jar over the candle, and after a while, the flame goes out. Why did the candle stop burning?

• The glass jar trapped all the heat, causing the candle to melt.

• The flame used up all the oxygen inside the jar, so the candle could no longer burn.

• The glass jar absorbed the flame, putting it out.

• The candle ran out of wax because it was too hot under the jar.

Multiple Choice

Sarah slices an apple and leaves it on the kitchen counter for a few hours. When she returns, she notices the apple slices have turned brown. What caused this change in color?

• The apple absorbed moisture from the air, turning it brown.

• The apple reacted with oxygen in the air, causing it to oxidize and turn brown.

• The apple was exposed to sunlight, which burned the surface and made it brown.

• The apple dried out, and the loss of water caused it to change color.

Multiple Choice

After cutting an apple, Mark puts half of it in a sealed plastic bag and leaves the other half on a plate in the open air. A few hours later, he notices the apple on the plate has turned brown, but the one in the bag has not. Why did the apple on the plate turn brown?

• The apple on the plate was exposed to moisture, which caused it to change color.

• 
  The apple in the bag absorbed all the oxygen, preventing it from turning brown.

• The apple on the plate reacted with oxygen in the air, leading to oxidation and browning.

• The apple in the bag was too cold to change color.

Multiple Choice

David left his iron bike outside in the yard for several weeks. When he checked it, he noticed reddish-brown spots forming on the metal parts of the bike. What is the most likely cause of these spots?

• The bike was exposed to too much sunlight, causing the metal to change color.

• The iron in the bike reacted with oxygen and moisture in the air, causing it to rust.
  

• 
  The bike absorbed water from the ground, leading to the formation of rust.

• The metal on the bike melted slightly, creating reddish-brown spots.

Multiple Choice

Lisa found an old iron nail in the garden that had a rough, flaky, reddish-brown coating on it. What process caused this coating to form on the nail?

• The nail absorbed moisture from the soil, which made it change color.

• The nail was scratched by rocks, which caused it to develop a reddish-brown layer.

• The nail reacted with oxygen and water over time, leading to the formation of rust.

• The nail was heated by the sun, which made it rust.

Multiple Choice

During gym class, Jenny runs several laps around the track. After running, she starts breathing heavily. Why does Jenny breathe more rapidly after exercising?

• Her body needs to cool down quickly, so she breathes faster.

• She is trying to remove sweat from her body by breathing heavily.

• Her lungs are working to get rid of carbon dioxide only, which makes her breathe faster.

• Her muscles require more oxygen to produce energy, so her breathing increases.

Multiple Choice

Sarah sees a small fire start in the trash can at home. Her mom quickly puts a damp towel over the fire. Why does this help to put out the fire?

• The towel increases the heat, causing the fire to burn itself out.

• The towel smothers the fire, cutting off its oxygen supply, which it needs to keep burning.

• The towel absorbs the flames, stopping the fire.

• The towel spreads water over the fire, which cools it down.

Open Ended

Why might understanding changes that happen in the presence of oxygen matter to me?

Open Ended

Why might understanding changes that happen in the presence of oxygen matter to my community?

Open Ended

Why might understanding changes that happen in the presence of oxygen matter to the world?